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    <script>
        // 大整型
        // let n = 521n
        // console.log(n,typeof(n));

        // 函数
        let n = 123
        console.log(BigInt(n));

        // 大数值运算
        let max = Number.MAX_SAFE_INTEGER
        console.log(max)
        console.log(max + 1)
        console.log(max + 2)

        console.log(BigInt(max));
        console.log(BigInt(max) + BigInt(1));
        console.log(BigInt(max) + BigInt(2));
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